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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f329bf6d59143a8c91e5a16f035d6bba9455e6151baff25fb9922d0727ed30' 
  AND token = 'JoUe2Y1oS2Gsro7PmnCqf5tVgG5qcCr8X6lY3mpTX3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}